Yeah, that's what I heard also. You have to rough up the surface of POR15 if you leave it to get the gloss off before over-painting. Such a pain.
This stuff mate, so far has been awesome and was the best one recommended to me. Its sprayed nice from the gun on 1 coat (and I was using a small tip, should use about 1.8 to get the stuff on the job). But despite this I've got really good coverage, i'm starting to think that I might not do a second coat - Partly because i'll be priming again using high fill later. But i'll see what I feel like in the morning.
It is a bit of a pain to clean up but normal thinners seem to work alright. I didn't get heaps of over-spay, but i'm just going to paint over it later I think, so i'm not too concerned.

Will let you know how it sands, but so far i'm impressed with it. I'm going to high fill using a U-pol primer later after I detail it because this one I was told wasn't all that heavy. Its a high fill primer, but doesn't have heaps of build to it. But its enough to cover scratches etc, and the TDS says that you can use it as a surfacer also, so with a bigger tip on the gun it should be pretty versatile. The main reason I used it was because it was the best thing for me to prime bare metal with to prevent rust further. As its zinc based and shouldn't be all that porous being epoxy. So i'll bog on top of that, then rub it back. And any other chips and scratch marks will be filled later.

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18

Sounds like you've got it all under control!

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1972 Datsun 1600, S14 SR20DET Engineered (204rwkW @ 17psi.)
viewtopic.php?t=6579
#SR20Datsun @SR20Datsun

Epotec sounds the goods. Just got to find somewhere in Newcastle that sells it now

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1970 ex Group A Rally P510
1971 P510
1972 180B SSS
1965 SP310 Fairlady
1966 SP311 Fairlady

I've put seam sealer on the engine bay. I haven't painted it yet. But to me it looks pretty ugly. What do you think? Should I keep it or remove it?
I guess my main concern is that it looks a little rough and isn't exactly uniform. Its got a few pits over it where i smoothed it over and its thicker in some spots than others. This could be that i'm being pedantic. But i'm a bit of a perfectionist when it comes to presentation.

Please ignore the body filler and the touch up paint.

I've rubbed the seam sealer off the high side of the panel overlap to try and show a bit more metal and make it look a little better. Opinions? Should i just try and clean it up and make it a little more uniform, and leave it, or should I just get rid of it?

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18

Keep it, but just give it a light sand. By the time you paint over it, you wont even notice it.

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1972 Datsun 1600, S14 SR20DET Engineered (204rwkW @ 17psi.)
viewtopic.php?t=6579
#SR20Datsun @SR20Datsun

You'd think that i'd find some sort of repair work on this car that was done PROPERLY so I didn't need to continually fix it up and spend hours doing it. Ahh well... (end of bitch session)

So my complaint comes from the fact that, I was motivated enough to start stripping paint off my guards ready for primer. Started paint stripping them last night, and layer after layer of paint started to remove itself, then high fill, then more paint, then body filler, and more body filler. So this morning I had enough and took to it with the wire wheel on the grinder, and discovered another textbook panel beating repair job. Awesome. That was then cut out sort of as square as i could get it.
Then the next step was to separate the outter skin, from the inner bracing. Then the had to cut away the inner part that was rusted out. And a new piece was bent into shape and fitted and welded in. The next section was bent up to follow the pattern of the sills. Same angles, better than the current guard was I think. Also treated to a heavy coat of cold gal primer. Then the next straight section was made, this was cut into shape, then had the end folded over so it would look factory. Being 1.1mm gal, it was a little harder to work with, but still came out pretty much dead on. This was then welded into place. The bottom section was also folded over once the top section was in, so to maintain perfect gap. Which I was able to achieve. I also added a bottom section which was rusting out also, and was temped to reinforce the hole that the guard bolt goes onto. But it looked ok, so will assess it later. I've coated it all in cold Gal because the day just got away from me. I've ground the welds down compared to that pic. And unfortunately i'm not going to be able to escape the fact that i'm going to have to use a bit of body filler to smooth this one out (which i'm relatively pissed off about - I hate body filler). However... Its better than it was before.

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18

Update.

On Thursday my datsun sent me to Hospital. I spent 7 hours waiting in fast track for a surgeon to come and cut a bit of metal out of my arm...

I was making good progress with the wire wheel on the angle grinder, when one of clusters of wound metal decided to shoot itself out at me. I didn't feel it go in, and its not like it hasn't happened before. But this one shot it into my forearm where I couldn't see it. Just when I had finished grinding, I was brushing the dirt off me when I felt something hard on my arm. That was too late and by that stage I had pushed it straight under my skin into my arm. Pretty cool I think. But now its a setback. Ahh well. These things happen.

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18

Dude, you are lucky it didn't go into your eye!!!

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1972 Datsun 1600, S14 SR20DET Engineered (204rwkW @ 17psi.)
viewtopic.php?t=6579
#SR20Datsun @SR20Datsun

wow thats crazy. ive had that before, but not all the way in.
project is looking good, nice repair on the guard.

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toys:

71' datsun 1600 - the project


90' 180sx - bit of sh*t skid machine. one day sr20det donor for the 1600.

Yeah, I was wearing safety glasses. One thing I'd protect most would be my eyes. I'd be screwed if I went blind. And after what happened to dad not long ago with his eye, I'm being really careful with mine.
I know!!! Normally they just stick in and you can just pull them out. Its happened to me numerous times before. But its only because I took my jumper off and it went into the softer part of the skin on my forearm that I didn't see it and I was covered in dirt. I had just finished and was about to go have lunch so I brushed the dirt off me, then realised that the sharp barb that I must have felt, I pushed what little was protruding out of my arm up under my skin. I wasn't impressed. But the x-ray is pretty cool if you ask me.

Thanks about the guard. It came up alright. Its back to bare metal, I need to prime it soon, just haven't had time.

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Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18

Yea those wire wheels can be pretty dangerous. I had one piece fly right through my cheek and out the other side, just under the safety glasses I was wearing. Always pays to have the right safety gear, I should have been wearing a face guard and not just safety glasses.

Looks like your car is coming along nicely anyhow, it's always satisfying to de-butcherise a car and make it something better.

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1971 Datsun P510 SR20DET 276 rwkW
2005 Mercedes AMG E55 350 kW
1969 Datsun P510 L20B EFI 95 rwkW
1975 Ford XB Fairmont GS Wagon 179rwhp
1980 Escort Van SR20DET unfinished
2002 Suzuki GSX1300R Hayabusa 185hp

As many loose panels as i could in primer. I need to source a new rear door, or do some open heart surgery because of the rust near the top where the rear quarter window sits. Other than that, its finally starting to come along nicely.

_________________
Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18

A few more updates. I've been working quite a bit lately and haven't had time to do all that i've wanted on the car. But in the mean time, I have been removing rust, cleaning, wire wheeling doing all that stuff to fix all the minor things and little details that I don't want to overlook.

_________________
Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18

Today was spend applying body filler to primed metal. Sanding it back, applying icing. Doing that in engine bay. Still not finished. Quite time consuming, but worth it in the end to make it look smooth as I think!

_________________
Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18

Ok, for the past few days, being in my carport while its been raining out side (has proved cumbersome because its limited my movements and what I can do) I have managed to block out most of the doors and guards, and front valance and boot lid (Although guards still need some touch ups).
Then today it was mostly fine until later this afternoon where it rained a tad, I managed to catch a break in the weather to spray the doors.
Will have to do the guards next week.

Not too much wrong with that one. Just a few touch ups. Drivers door needed a little bit of a fix just where the repair section was on the bottom. Same thing again, slight repair work. This was the worst door. Had been hit previously, and nocked out with what must have been a nail punch on the inside, I ended up having to smooth over the entire door. I'll see how it goes, may consider buying a new one. All sprayed with the help of 1000W flood lights to provide some little heat and a bit of light to see. My door slipped off the stand it was resting on and bumped a dent from the inside of the skin. Fell through the center door panel. Serves me right resting it on a bar stool for a frame. Ahh well, more body work for me, didn't get out of it that easy.

_________________
Ongoing Project: 1972 Datsun 510 S13 SR20Det. http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18